Heat oven to 350 F.
Prepare a 9 x 13 inch pan by lining it with parchment paper. Spray the parchment with nonstick cooking spray.
In a medium bowl, combine the butter, coconut oil, sugar, eggs, and vanilla. Stir to combine.
In a small bowl, combine flour, cocoa powder, and salt. Stir.
Pour the dry ingredients into the wet ingredients. Stir just until they pull together. There will still be a few clumps.
Add the chocolate chips and 1 cup of trail mix and stir.
Pour the batter into the lined pan and sprinkle evenly with the remaining trail mix. Press the trail mix into the batter a little.
Bake for 32 minutes. The batter will be barely set in the middle. Do not do a toothpick test. If you jiggle the pan and see the middle move, then put it back in the oven for about 2 minutes.
Allow the brownies to cool in the pan for 15 minutes. If you remove them too early, they'll fall apart. Let them set up in the pan a little while.
Remove the brownies from the pan by using the parchment as handles. Move the brownies and parchment to a cooling rack.
Serve Trail Mix Brownies warm or cool.